/*
 * Copyright (c) Kumo Inc. and affiliates.
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <melon/singleton_thread_local.h>

namespace melon::detail {
    MELON_NOINLINE SingletonThreadLocalState::Tracking::Tracking() noexcept {
    }

    MELON_NOINLINE SingletonThreadLocalState::Tracking::~Tracking() {
        for (auto &kvp: caches) {
            kvp.first->object = nullptr;
        }
    }

    MELON_NOINLINE void SingletonThreadLocalState::LocalLifetime::destroy(
        Tracking &tracking) noexcept {
        auto &lifetimes = tracking.lifetimes[this];
        for (auto cache: lifetimes) {
            auto const it = tracking.caches.find(cache);
            if (!--it->second) {
                tracking.caches.erase(it);
                cache->object = nullptr;
            }
        }
        tracking.lifetimes.erase(this);
    }

    MELON_NOINLINE void SingletonThreadLocalState::LocalLifetime::track(
        LocalCache &cache, Tracking &tracking, void *object) noexcept {
        cache.object = object;
        auto const inserted = tracking.lifetimes[this].insert(&cache);
        tracking.caches[&cache] += inserted.second;
    }
} // namespace melon::detail
